Aunit of area often used in measuring land areas is the hectare, defined as 104 m2. an open-pit coal mine consumes 75 hectares of land, down to a depth of 26 m, each year. what volume of earth, in cubic kilometers, is removed in this time?

Explanation:

1 hectare = 10^4 m^2

Area of pit, A = 75 hectare

convert hectare into m^2

A = 75 x 10^4 m^2

depth, d = 26 m

Volume of earth removed is V.

V = area of pit x depth

V = A x d

V = 75 x 10^4 x 26 = 1950 x 10^4 m^3

Convert cubic metre into cubic km

1 m = 10^-3 km

1 m^3 = 10^-9 km^3

So,

question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

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